And they did. We saw them. Maybe they could have been "recalibrated" to detect the motion of the hamsters, but I don't see how that would have helped them detect a motionless egg.

Ah, my apologies. I was not referring to the motion trackers carried by the marines. I was referring to the onboard systems, ships AI, whatever they may have had. If such a system was incapable of locating and warning the crew of an unknown biological presence, then given the information obtained from Ripley before arrival, surely something could've been set to search for signs of non-human biological material. Motion aside. Could there not exist any technology that could identify and locate such a thing? Especially given the fact that they're familiar with "bugs". Surely the military of the future can detect the presence of biological weapons or unknown materials onboard their ships?

It would've been nice to know they had the capability to check for such contaminants in real-time.

I don't believe they do.

Ripley had to actively conduct a focused search using the medscan. It's not like it had picked it up after evacuating the Sulaco and there was a message waiting for her after the crash saying 'You have 1 new embryo in your chest'.

That's right. It was only after Elba informed them the pups were picking up a life-form that the question about movement was brought up. So perhaps they could also detect non moving organic matter as well.

And they did. We saw them. Maybe they could have been "recalibrated" to detect the motion of the hamsters, but I don't see how that would have helped them detect a motionless egg.

Ah, my apologies. I was not referring to the motion trackers carried by the marines. I was referring to the onboard systems, ships AI, whatever they may have had. If such a system was incapable of locating and warning the crew of an unknown biological presence, then given the information obtained from Ripley before arrival, surely something could've been set to search for signs of non-human biological material. Motion aside. Could there not exist any technology that could identify and locate such a thing? Especially given the fact that they're familiar with "bugs". Surely the military of the future can detect the presence of biological weapons or unknown materials onboard their ships?

"That platform was becoming unstable. I had to circle around..." er something. So anything couldve climbe don board during that first land. NO?

That's right. It was only after Elba informed them the pups were picking up a life-form that the question about movement was brought up. So perhaps they could also detect non moving organic matter as well.

Wasn't it the Engineer in Hypersleep that was being detected? As for the Hammerpedes, perhaps they couldn't be detected because they were submerged, do we have evidence they could be seen if they were also cold-blooded?